CHEMISTRY. 



Index- Starch, 1 10 



Stoneware, specific heat of, 39 



Storax, 126 



Strontiun, 47 



Strontiane, 65 



Strontium, 47 



Styrax, balsam of, 126 



Suber, 129 



Suberic acid, 66 



Substances, simple, 9 



Succintc acid, J7 



Sugar, 107 



Sulphates, 79 



Sulphites, 80 



Sulphur, 13 



specific heat of 39 

 oxide of, 13 

 phosphuret of, ib. 



Sulphureted hydrogen, ib. 



Sulphuric acid, 13, 51 



Table of the strength, and 

 boiling point of, 52 



Sulphurous acid, 1 3, 52 



Sulphurane, 64 



Sun, 40 



Table of chemical decomposi- 

 tions, 103 

 acid supporters, 51 



Table of the strength andboiling 

 pointof nitric acid, 55 

 the strength and boil- 

 ing point of sulphu- 

 ric 'acid, 52 

 the latent heat of bo- 

 dies, 37 



the specific heat of bo- 

 dies, 38 



the colours which co- 

 lorific acids strike 

 with the metals, 63 

 Table containing the properties 



of the metals, 30 

 of the oxides of the me- 

 tals, 31 



Tacamahac, 123 

 Tannin, 116 

 Tannin, natural, 63 



artificial, 62 

 Tantalum, 30 

 Tar, mineral, 72 

 Tartaric acid, 58 

 Tears, 116 

 Tellurium, 27 



oxides of, ib. 

 alloy of, ib. 



Tellurium, salts of, 95 

 Temperature, equal distribu- 

 tion of, 35 



Tendons, 161 

 Thermometer, 35 



differential, 33 

 Fahrenheit's 151 

 Tin, 23 



oxides of, 24 

 phosphuret of, ib. 

 sulphuret of, ib. 

 alloys of, ib. 

 plate, ib. 

 salts of, 91 

 Tinned copper, 24 

 Titanium, 30 



oxides of, ib. 

 salts of, 96 

 Train oil, 135 

 Tolu, balsam of, 125 

 Tungsten, 29 



oxides of, ib. 

 Tungstic acid, 5& 



U 



Unconfinable bodies, 31 

 Ulmin, 110 

 Uranium, salts of, 96 

 Urine, properties of, 150 

 composition of, ib. 

 Uric acid, 59 

 Urinary calculi, 151 

 Urea, 134 



163 



Valentine, Basil, 4 

 Varnish amber, 124 

 Vegetable substances, specific 



heat of, 39 

 Vegetables, 106 

 Vinegar, 57 



W 

 Water, 49, 105 



specific heat of, 39 

 Wax, 119 



Wedgewood's pyrometer, 47 

 Whey, 144 

 Wood, 129 

 Weulfe's apparatus, 159 



Yttria, 47 



Z 



Zinc, 85 



oxides of, ib. 



phosphuret of, 26 



sulphuret of, ib. 



alloys of, ib. 



salts of, 93. 

 Zincane, 66 

 Zirconia, 48 

 Zirconium, 4S 



Inder. 



CHE 



CHEMMIS. See ACHMIM. 



CHENOLIA, a genus of plants of the class Pen- 

 * an ^ r ' a > a "d order Monogynia. See BOTANY, p. 156. 



CHENOPODIUM, a genus of plants of the class 

 Pentandrta, and order Digynia. See BOTANY, p. 160. 



CHEPEWYANS. See CANADA, p. 343. 



CHEPSTOW, a town of England, in Monmouth- 

 shire, situated near the mouth of the river Wye, partly 

 in a deep hollow, but chiefly on the steep side of a hill. 

 The houses are tolerably built, and the streets, though 

 irregular, are broad and well paved. 



Chepstow was formerly surrounded with walls, and 

 was defended by a strong castle, which seems to have 

 been built in the time of the conquest by William Fitz- 

 Osborn, Earl of Hereford. The remains of this stupen- 

 dous pile occupy a large tract of ground, and extend 

 along the brow of a perpendicular cliff, of which its walls, 

 in many places appear to form a part. The river Wye 

 runs at the bottom of this cliff, and flowing through 

 some of the arches defends it on one side, while on the 

 land side it is protected by an immense moat, and by the 

 lofty .bastion towers by which its walls are flanked. The 

 grand entrance on the east, which is by a circular arch 

 between two round towers, is a fine specimen of the early 

 Norman architecture. This entrance leads into the 

 first ourt, containing the grand hall, kitchen, and other 

 apartments. The second court, which is now used as a 

 garden, is entered from the first by a gate at the side of 

 a rour.d tower ; and in the third court, which is enter- 

 ed from the second, is situated the roofless chapel, with 

 pointed arched windows, and tiers of semicircular arches 

 along the wall. A winding staircase at the south west- 

 ern extremity of the third court conducts to the battle- 

 ments, and the entrance to the fourth court is by a sally 

 port in the wall. The most interesting part of thin cas- 

 tle is the grand tower at the south eastern angle of the 

 first court, in which Henry Martin, one of the murderers 

 of Charles I. was confined for thirty years. This tower 



C'H E 



has generally'been represented as a dark and miserable Chepstow, 

 dungeon, but Mr Coxe's description completely contra- '^^T*** 

 diets this opinion. " The first story of this tower, ( says 

 he,*) contains an apartment which was occupied by him- 

 self and his wife ; above were lodgings for his domestics. 

 The chamber in which he usually' lived is not less than 

 thirty-six feet in length, and twenty-three in breadth, 

 and of proportionate height. It was provided with two 

 fire places, and three windows, two of which appear to 

 be the original apertures, and the third was probably en- 

 larged for hit convenience." 



The presentparish church of Chepstow consists chiefly 

 of the remains of the old priory for Benedictine monks. 

 Within the church, the circular arches of the nave still 

 exist, and the remain , of the ancient choir and cross aisle 

 may be traced by the foundations on the outside. The 

 formvr entrance was by a beautiful semicircular arched 

 doorway, decorated with fine mouldings. A smaller 

 arch, ornamented in the same way, is on each side of the 

 doorway. 



The bridge over the Wye, half of which is in Glou- 

 cestershire, has a level floor, and was formerly supported 

 by timber piers about forty feet high. It underwent, 

 however, a thorough repair in 1791. The wooden piers 

 still remain in the Gloucester side, but on the other side 

 they have been replaced by stone piers. The massive central 

 pier which separates the two counties is of stone. The 

 wooden piers present a very narrow surface to the stream. - 



There is an ebbing and flowing well in a garden in 

 Bridge-street, remarkable for the excellence of its water. 

 It is about 14 feet deep, and frequently contains 14 feet 

 of water. A little before high tide, the water begins to 

 subside j at high tide it becomes perfectly dry, and soon 

 after the ebb the water returns. The flow of the well 

 is in no respects affected by wet and dry weather. 



As the channel of the river Wye is very narrow in 

 proportion^ to that of the Severn, and is confined by 

 perpendicular rocks, the tide flow* up to the town with 



Coxe's Ilittorical Tour in AfinmovtkMre, p. 378, 



